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Salt of Weak Acid and Strong Base

37. Whai form...

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37. Whai formula for calculation of ph of aqueous solution of NaCN

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p K_{b}

C N^{-}

25^{o}

4.7

p H

0.5 M

N a C N

p K_{b}

C N^{-}

25^{o} C

p H

of 0.5 M aqueous

N a C N

Q. What is the pH of a 0.50 M aqueous NaCN solution?

p K_{a}

of HCN is 9.22]

p H

0.00424 M

aqueous solution of

K O H

Q. How many gram moles of

H C l

will be required to prepare one litre of a buffer solution (containing

N a C N

H C N

8.5

0.10 g

formula mass of

N a C N

K_{a}

H C N = 4.1 \times 10^{- 10}

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Salt of Weak Acid and Strong Base

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